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If the server is run twice the second will not work because it will try to listen on the same port. And that's not possible. Anyway you have to understand that Nuxeo IDE starts Nuxeo as usual with the launcher but with a dedicated nuxeo.conf. So having 2 jvm started is normal: one for eclipse and one for tomcat. And if you stop the server through IDE and the server is not available you can be confident on the fact that the server is down.